and a hospital was evacuated after someone noticed an unattended car with case begans inside. again, it was determined there was no threat. live in the newsroom, ken wayne. >> in two minutes, we will take you to a bay area forensics lab. find out why cell phone video is often more helpful than video from surveillance cameras. >>> tonight, we're learning more about the young graduate student killed on monday. boston university identified her today at lingzi lu. a chinese national who was studying math and statistics. friends say she was 23 years old. lu had gone to the marathon with two friends. one of whom was injured and now hospitalized. she -- her professors describe her as a vivacious, outstanding student. friends say she was optimistic, and outgoing, that she was a fan of the band nirvana, and that she loved spring time in boston. >>> we're getting late word tonight from the mother of the 11-year-old boy in martinez who was injured by shrapnel in the bombings. she said aaron hern is improving, and his breathing tube has been removed. today's surgery went well, and all of